CN115897412A - Positioning construction method for steel anchor box of circular arch main tower of cable-stayed bridge - Google Patents
Positioning construction method for steel anchor box of circular arch main tower of cable-stayed bridge Download PDFInfo
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- CN115897412A CN115897412A CN202310009555.1A CN202310009555A CN115897412A CN 115897412 A CN115897412 A CN 115897412A CN 202310009555 A CN202310009555 A CN 202310009555A CN 115897412 A CN115897412 A CN 115897412A
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Abstract
The invention provides a positioning construction method for a circular arch main tower steel anchor box of a cable-stayed bridge, which comprises the following steps: s1, measuring the axial line shape and the verticality of a main tower, and determining the installation time period of a steel anchor box; s2, determining and laying installation positioning points of the segmental steel anchor boxes; s3, retesting the installation positioning points determined in the S2, and installing the segmental steel anchor boxes; s4, determining a cable guide pipe anchoring point and a cable guide pipe outlet position point on the segmental steel anchor box, and setting a cable guide pipe outlet IP lofting identification point; s5, re-measuring the IP lofting identification points at the outlet of the cable guide pipe, and installing a cable guide pipe embedded section; s6, installing the template on the tower wall of the main tower, connecting a cable guide pipe transitional connecting steel plate at the end part of the embedded section of the cable guide pipe, and connecting a cable guide pipe rear connecting section on the cable guide pipe transitional connecting steel plate; and S7, repeating the steps S2 to S6. The method has the effect of solving the problems of inaccurate installation, box construction period and construction cost caused by the fact that the positioning difficulty is high in the installation of the steel anchor box in the main tower in the prior art.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a positioning construction method for a circular arch main tower steel anchor box of a cable-stayed bridge.
Background
The cable-stayed bridge is a common bridge type of a large-span bridge, and is more and more widely applied to the construction of numerous bridges at home and abroad due to the unique characteristics of beautiful line shape, relatively lighter structural weight and material saving of a main tower structure. The bridge is a bridge with a main beam directly pulled on a bridge tower by a plurality of guys, and is a structural system formed by combining a pressure-bearing tower, a pulled guy and a bending-bearing beam body; the cable-stayed bridge mainly comprises a cable tower, a main beam and a stay cable. During installation, the steel anchor box is required to be installed in the cable tower, and one end of the cable guide pipe is fixedly connected to the steel anchor box.
At present, the steel anchor box installed in the cable-stayed bridge tower is usually manufactured in a factory and then installed in sections on site, and the installation mode has the defects of difficult control such as processing errors, accumulated installation errors and the like, and mainly shows that:
1. before the steel anchor box is installed, a placement point needs to be observed on an installation point, but under the influences of swing of a bridge tower, wind speed, weather, air temperature and the like, initial positioning and accurate positioning of the steel anchor box are difficult, and the installation period is long;
2. in the prior art, the hydraulic creeping formwork construction process is adopted in the construction of the circular arch-shaped tower column, but due to the fact that the spatial coordinates of each section of steel anchor box cable guide pipe are inconsistent, one end of the cable guide pipe connected to the steel anchor box is downwards inclined and extends out of the surface of the tower column by 100mm (the shortest position distance), each section of creeping formwork template needs to be adaptively modified, the construction difficulty is increased, the construction period is prolonged, the construction cost is increased, and the construction quality is difficult to guarantee.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a positioning construction method for a circular arch main tower steel anchor box of a cable-stayed bridge, which can solve the problems of inaccurate installation, box construction period and construction cost caused by high positioning difficulty in the installation of the steel anchor box in the main tower in the prior art.
According to the embodiment of the invention, the positioning construction method of the circular arch main tower steel anchor box of the cable-stayed bridge comprises the following steps:
s1, measuring the axial line shape and the verticality of a main tower, monitoring and collecting stress strain data of the main tower at different time and air temperatures, and determining the installation time period of a steel anchor box;
s2, determining installation positioning points of the segmental steel anchor boxes in the installation time period determined in the S1, and laying;
s3, in the installation time period determined in the S1, retesting the installation positioning points determined in the S2, and installing the segmental steel anchor box;
s4, determining coordinates and elevations of cable guide pipe anchoring points and coordinates and elevations of cable guide pipe outlet position points on the section steel anchor boxes in the installation time period determined in the S1, and setting cable guide pipe outlet IP lofting identification points at the tower wall outlet of the main tower;
s5, in the installation time period determined in the S1, retesting the IP lofting identification point of the cable guide pipe outlet determined in the S4, and installing a cable guide pipe embedded section, wherein one end of the cable guide pipe embedded section is installed in the steel anchor box, and the other end of the cable guide pipe embedded section is installed in the main tower and extends to the IP lofting identification point of the cable guide pipe outlet;
s6, installing a template on the tower wall of the main tower, connecting a cable guide pipe transitional connecting steel plate at the end part of the embedded section of the cable guide pipe, wherein the cable guide pipe transitional connecting steel plate and the template are positioned on the same plane, and finally pouring concrete in the cavity of the template, and connecting a cable guide pipe rear connecting section on the cable guide pipe transitional connecting steel plate;
and S7, repeating the steps S2-S6 until the installation of each section of steel anchor box and the cable guide pipe thereof is completed.
Preferably, in the step S1, monitoring points are arranged in the middle of each construction section of the main tower and at the top of each tower section through a total station so as to measure the axial line shape and the verticality of the main tower; and 4 strain sensors are arranged at four corner points of a tower column interface to monitor and collect stress strain data of the main tower at different time and air temperatures.
Preferably, in step S1, the installation period is from 7 to 00 in the morning and from 19 to 21 in the evening.
Preferably, in the step S2, before the concrete is poured to the bottom elevation of the first section of steel anchor, the embedded positions of the embedded steel plates and the embedded steel bars are accurately positioned in advance by using a total station, and embedding and laying are performed.
Preferably, in the step S3, when the first-segment steel anchor box is installed, the top surface elevation of the embedded steel plate is measured again.
Preferably, in step S2, when the installation positioning points of the other steel anchor boxes are determined, a stiff framework is installed on the main tower column, and then the elevations and positions of the angular points of the steel anchor boxes are set out on the stiff framework through a total station to form the installation positioning points and the installation positioning points are distributed on the stiff framework.
Preferably, in the step S3, when installing other steel anchor boxes, the BIM technology is firstly adopted to simulate and calculate the gravity center and the lifting point of each steel anchor box, then the steel anchor box is hoisted and temporarily reinforced at the installation positioning point, and then the total station is adopted to recheck the plane position and the elevation for many times in the installation time period, so as to ensure that the elevation deviation is less than or equal to 2mm, the plane position deviation is less than or equal to 5mm, and the four corners deviation of the anchor box is less than or equal to 2mm, the steel anchor box is reinforced.
Preferably, in step S4, when the cable guide anchoring point and the cable guide outlet position point of the cable guide are lofted, the vertical axis of the cable guide is lofted by using the total station to determine the vertical plane where the cable guide is located, so that the relative deviation angle between the connecting line of the cable guide anchoring point and the cable guide outlet position point and the stay cable axis meets the design requirement.
Preferably, in the step S5, when the cable duct embedded section is installed, the cable duct embedded section is hoisted by a tower crane, and the chain block is used for adjusting the plane position and the elevation of the control point of the cable duct embedded section, so as to ensure that the control point coincides with the IP lofting identification point of the cable duct outlet.
In summary, the invention includes at least one of the following beneficial technical effects:
1. by measuring the axial line shape and the verticality of the main tower and monitoring and collecting stress strain data of the main tower at different time and air temperatures, the elevation and the displacement of the main tower in the construction process are changed, so that the change of the installation positioning point of the steel anchor box is controlled, the optimal time for installing the steel anchor box is determined, the accurate positioning of the steel anchor box is ensured, and the installation monitoring time is shortened; the cableway pipe is arranged into a cable conduit embedded section, a cable conduit transitional connecting steel plate and a cable conduit rear connecting section to be installed in a segmented mode, the transformation of each section of creeping formwork template due to the fact that the space coordinates of each section of steel anchor box cable conduit are inconsistent is avoided, the anchor box is installed in the tower in a rapid and accurate positioning mode, the problems that in the prior art, the positioning difficulty is large in the installation of the steel anchor box in the main tower, the installation is not accurate, and the construction of the anchor box in the tower in a rapid and accurate positioning mode due to the box construction period and the construction cost are solved;
2. by determining the anchor point of the cable guide pipe and the outlet position point of the cable guide pipe and utilizing the auxiliary paying-off of the two points, the relative deviation angle between the cable control guide pipe and the axis of the stay cable meets the design requirement, and the accurate installation of the embedded section of the cable guide pipe in the steel anchor box body is realized;
3. adopt BIM technical simulation to calculate every section of steel anchor case focus and hoisting point, specifically set for according to every section of steel anchor case slope different situation, can accomplish quick initial positioning of steel anchor case hoist and mount installation and finely tune accurate location to effectively reduce traditional steel anchor case hoist and mount installation because the time of positioning adjustment repeatedly, accelerate the construction progress.
Drawings
FIG. 1 is an elevation view of the installation of the steel anchor box of the present invention;
FIG. 2 isbase:Sub>A cross-sectional view A-A of FIG. 1;
FIG. 3 is a flow chart of the construction of the embodiment of the present invention.
In the above drawings: 1. a strain sensor; 2. cable guide anchor points; 3. cable duct exit location points; 4. a cable conduit pre-embedded section; 5. IP lofting identification points at the outlet of the cable guide pipe; 6. the cable guide pipe is in transition connection with a steel plate; 7. a cable duct rear connecting section.
Detailed Description
The invention will be further described with reference to the accompanying figures 1-3.
Referring to fig. 1 to 3, an embodiment of the present invention provides a cable-stayed bridge circular arch main tower steel anchor box positioning construction method, including the following steps:
s1, measuring the axial line shape and the verticality of a main tower, monitoring and collecting stress strain data of the main tower at different time and air temperatures, and determining the installation time period of a steel anchor box;
in the process, monitoring points are arranged at the middle part of each construction section and the top of each tower section of the main tower through a total station so as to measure the axial line shape and the perpendicularity of the main tower; referring to fig. 2, by arranging 4 strain sensors 1 at four corner points of a tower column interface, specifically, 4 strain sensors may be arranged at four corner points of each of sections of a tower bottom section, a section corresponding to ZS21, ZS19, ZS11, ZS9 cables, a center of a tower crown and a top-bottom section thereof, and a top-bottom section of a lower tower column, so as to monitor and collect stress strain data of a main tower at different time and air temperatures.
In the process of installing the steel anchor box, the monitoring data change is large under the environments of different time and different temperature, so that the installation and construction are carried out in a time period when the observation data are stable; specifically, under the condition that the temperature is low and the change is stable in the morning and evening of a day, the observation data are stable, so the steel anchor box is installed in the morning and evening, preferably, the installation time period is from 7 to 00 in the morning to 19 to 21 in the evening.
S2, determining installation positioning points of the segmental steel anchor boxes within the installation time period determined in the S1, and laying;
in the process, when the installation positioning point of the first-section steel anchor box is determined, in the installation time period determined in the step S1, when concrete is poured as an installation foundation and before the bottom elevation of the first-section steel anchor box, the embedded positions of the embedded steel plates and the embedded steel bars are accurately positioned in advance by using a total station, and the embedded steel plates and the embedded steel bars are embedded so as to facilitate the installation of the subsequent first-section steel anchor box.
Meanwhile, in the process, when the installation positioning points of other sections of steel anchor boxes are determined, firstly installing a stiff framework on a tower column of the main tower, then calculating coordinates of each angular point of the steel anchor boxes on different elevation surfaces according to a design drawing, lofting the elevation and the position of each angular point of the steel anchor boxes on the stiff framework through a total station to form the installation positioning points and distributing the installation positioning points on the stiff framework; wherein, the setting mode of installation setpoint does: and welding an iron plate with a hole in the middle on the stiff framework.
S3, in the installation time period determined in the S1, retesting the installation positioning points determined in the S2, and installing the segmental steel anchor box;
in the process, when the installation positioning points of the first section of steel anchor box are retested, the top surface elevation of the embedded steel plate needs to be retested firstly. When the first section steel anchor box is installed, a tower crane is adopted to assist hoisting, and after the top surface elevation of the predicted steel plate is determined through retesting, the steel plate is anchored through high-strength bolts.
In the process, when other sections of steel anchor boxes are installed, the gravity center and the lifting point of each section of steel anchor box are simulated and calculated by adopting a BIM technology so as to ensure the stability of the steel anchor box during lifting; then hoisting the steel anchor box and temporarily reinforcing the steel anchor box at an installation positioning point to finish primary installation; and rechecking the position and the elevation of the plane for multiple times in the installation time period by using a total station instrument, ensuring that the elevation deviation is less than or equal to 2mm, ensuring that the deviation of the position of the plane is less than or equal to 5mm, and reinforcing the steel anchor box when the deviation of four corners of the anchor box is less than or equal to 2 mm.
S4, determining the coordinate and elevation of the cable guide pipe anchoring point 2 and the coordinate and elevation of the cable guide pipe outlet position point 3 on the segmental steel anchor box in the installation time period determined in the S1, and arranging a cable guide pipe outlet IP lofting identification point 5 at the tower wall outlet of the main tower;
in the process, a vertical axis of a cable guide pipe is firstly used for lofting by using a total station instrument, a vertical plane where the cable guide pipe is located is determined, the cable guide pipe is accurately positioned on the vertical axis, and the cable guide pipe is only fixed left and right and can move up and down along the axis; then, lofting the coordinates (mainly including mileage and elevation control) of the outlet position point 3 of the cable guide pipe at the tower outlet end by using a total station, and preliminarily positioning the outlet position point 3 of the cable guide pipe at the tower outlet end; then a total station is used for lofting out coordinates (mainly including mileage and elevation control) of a cable guide pipe anchoring point 2 at the end of the designed tower, and the cable guide pipe anchoring point 2 is positioned; and the relative deviation angle a between the anchor point 2 of the cable guide pipe and the outlet position point 3 of the cable guide pipe and the axis of the stay cable meets the design requirement.
S5, in the installation time period determined in the S1, retesting the IP lofting identification point 5 of the cable conduit outlet determined in the S4, and installing the cable conduit embedded section 4, wherein one end of the cable conduit embedded section 4 is installed in the steel anchor box, and the other end of the cable conduit embedded section is installed in the main tower and extends to the IP lofting identification point 5 of the cable conduit outlet;
in the process, when the IP lofting identification point 5 of the cable conduit outlet determined in the S4 is retested, the plane position and elevation deviation are controlled within 5 mm; when the cable duct embedded section 4 is installed, the cable duct embedded section is hoisted through a tower crane, and the plane position and the elevation of the control point of the cable duct embedded section 4 are adjusted by using a chain block, so that the cable duct embedded section is ensured to be superposed with the IP lofting identification point 5 at the outlet of the cable duct.
S6, installing the template on the tower wall of the main tower, connecting a cable guide pipe transition connecting steel plate 6 at the end part of the cable guide pipe embedded section 4, enabling the cable guide pipe transition connecting steel plate 6 and the template to be located on the same plane, finally pouring concrete in a cavity of the template, and connecting a cable guide pipe rear connecting section 7 on the cable guide pipe transition connecting steel plate 6 through a flange.
And S7, repeating the steps S2-S6 until the installation of each section of steel anchor box and the cable guide pipe thereof is completed.
In the construction steps, when observation is carried out to determine the installation positioning point, the average value of the large and small mileage and the observed values in the four upstream and downstream directions of the rotation of the tower crane is taken to eliminate the influence of the rotation of the tower crane and ensure the accuracy of finding the installation positioning point.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (9)
1. A method for positioning and constructing a circular arch main tower steel anchor box of a cable-stayed bridge is characterized by comprising the following steps of:
s1, measuring the axial line shape and the verticality of a main tower, monitoring and collecting stress strain data of the main tower at different time and air temperatures, and determining the installation time period of a steel anchor box;
s2, determining installation positioning points of the segmental steel anchor boxes in the installation time period determined in the S1, and laying;
s3, in the installation time period determined in the S1, retesting the installation positioning points determined in the S2, and installing the segmental steel anchor box;
s4, determining the coordinate and elevation of the cable guide pipe anchoring point (2) and the coordinate and elevation of the cable guide pipe outlet position point (3) on the segmental steel anchor box in the installation time period determined in the S1, and arranging a cable guide pipe outlet IP lofting identification point (5) at the tower wall outlet of the main tower;
s5, in the installation time period determined in the S1, retesting the IP lofting identification point (5) of the cable guide pipe outlet determined in the S4, and installing the cable guide pipe embedded section (4), wherein one end of the cable guide pipe embedded section (4) is installed in the steel anchor box, and the other end of the cable guide pipe embedded section is installed in the main tower and extends to the IP lofting identification point (5) of the cable guide pipe outlet;
s6, installing a template on the tower wall of the main tower, connecting a cable guide pipe transition connecting steel plate (6) at the end part of the cable guide pipe embedded section (4), wherein the cable guide pipe transition connecting steel plate (6) and the template are positioned on the same plane, and finally pouring concrete in a cavity of the template, and connecting a cable guide pipe rear connecting section (7) on the cable guide pipe transition connecting steel plate (6);
and S7, repeating the steps S2-S6 until the installation of each section of steel anchor box and the cable guide pipe thereof is completed.
2. The cable-stayed bridge circular arch main tower steel anchor box positioning construction method according to claim 1, characterized in that: in the step S1, monitoring points are arranged at the middle part and the top of each construction section of the main tower through a total station to measure the axial line shape and the perpendicularity of the main tower; and 4 strain sensors (1) are arranged at four corner points of a tower column interface to monitor and collect stress strain data of the main tower at different time and air temperatures.
3. The cable-stayed bridge circular arch main tower steel anchor box positioning construction method according to claim 2, characterized in that: in step S1, the installation time period is from 7 to 00 in the morning to 19 in the evening.
4. The cable-stayed bridge circular arch main tower steel anchor box positioning construction method according to claim 1, characterized in that: and S2, accurately positioning the embedded positions of the embedded steel plates and the embedded steel bars in advance by using a total station before the concrete is poured to the bottom elevation of the first section of steel anchor box, and embedding and laying.
5. The cable-stayed bridge circular arch main tower steel anchor box positioning construction method according to claim 4, characterized in that: and S3, when the first section of steel anchor box is installed, firstly, measuring the top surface elevation of the embedded steel plate again.
6. The cable-stayed bridge circular arch main tower steel anchor box positioning construction method according to claim 4, characterized in that: in the step S2, when the installation positioning points of other sections of steel anchor boxes are determined, firstly, a stiff framework is installed on a main tower column, and then the elevation and the position of each angular point of the steel anchor box are lofted on the stiff framework through a total station to form the installation positioning points and the installation positioning points are distributed on the stiff framework.
7. The cable-stayed bridge circular arch main tower steel anchor box positioning construction method according to claim 6, characterized in that: in the step S3, when other sections of steel anchor boxes are installed, the BIM technology is adopted to simulate and calculate the gravity center and the lifting point of each section of steel anchor box, then the steel anchor box is lifted and temporarily reinforced at an installation positioning point, and then a total station is adopted to recheck the plane position and the elevation for multiple times in an installation time period, so that the elevation deviation is less than or equal to 2mm, the plane position deviation is less than or equal to 5mm, and when the four-corner deviation of the anchor box is less than or equal to 2mm, the steel anchor box is reinforced.
8. The cable-stayed bridge circular arch main tower steel anchor box positioning construction method according to claim 1, characterized in that: in the step S4, when the cable guide pipe anchoring point (2) and the cable guide pipe outlet position point (3) of the cable guide pipe are lofted, the vertical axis of the cable guide pipe is lofted by using a total station instrument, and the vertical plane where the cable guide pipe is located is determined, so that the relative deviation angle between the connecting line of the cable guide pipe anchoring point (2) and the cable guide pipe outlet position point (3) and the axis of the stay cable meets the design requirement.
9. The cable-stayed bridge circular arch main tower steel anchor box positioning construction method according to claim 8, characterized in that: in the step S5, when the cable duct embedded section (4) is installed, the cable duct embedded section is hoisted through a tower crane, and the plane position and the elevation of the control point of the cable duct embedded section (4) are adjusted through a chain block, so that the cable duct embedded section is enabled to be overlapped with the IP lofting identification point (5) at the outlet of the cable duct.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310009555.1A CN115897412A (en) | 2023-01-04 | 2023-01-04 | Positioning construction method for steel anchor box of circular arch main tower of cable-stayed bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310009555.1A CN115897412A (en) | 2023-01-04 | 2023-01-04 | Positioning construction method for steel anchor box of circular arch main tower of cable-stayed bridge |
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| CN115897412A true CN115897412A (en) | 2023-04-04 |
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| CN202310009555.1A Pending CN115897412A (en) | 2023-01-04 | 2023-01-04 | Positioning construction method for steel anchor box of circular arch main tower of cable-stayed bridge |
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| CN (1) | CN115897412A (en) |
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- 2023-01-04 CN CN202310009555.1A patent/CN115897412A/en active Pending
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